Let's assume this hypothetical.
My son is now 18 years old. Since he was 8, I've been setting aside the annual gift exclusion amount and placing it in a safe in my house. With snipers guarding said safe :)
4 People are involved.
My brother, my father, my father in law and myself. I gift each one of them the annual gift exclusion, in which they instantly turn around and gift that money to my son.
2010: 13,000 x 4 = 52,000
2011: 13,000 x 4 = 52,000
2012: 13,000 x 4 = 52,000
2013: 14,000 x 4 = 56,000
2014: 14,000 x 4 = 56,000
2015: 14,000 x 4 = 56,000
2016: 14,000 x 4 = 56,000
2017: 14,000 x 4 = 56,000
2018: 14,000 x 4 = 56,000
2019: 15,000 x 4 = 60,000
That amount would come out to: $552,000 in 10 years. On his 18th birthday, he went and purchased a $552,000 house.
Since none of the spouses are involved, this wouldn't be considered gift splitting, and no one would need to file a form 709 out. No one has to claim anything since I gifted them, and they gifted my son.
....Right?